Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5887b22e544da1…

MALICIOUS

PDF

68.1 KB Created: 2020-11-11 23:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21465a0833e4c29c1f4b7ae07352563f SHA-1: 2ed2092e69bbf4a7b494f912f11581d7cfd5efbe SHA-256: 5c5887b22e544da1fe926c39eb3d2aeff10df14e4d0f753cc8d79946ca6106d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to Weebly-hosted PDFs with numeric slugs, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffking.ru/123?utm_term=definicion+de+medio+de+comunicacion+pdf
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/lovolewakezunepika.pdf
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f956ac429122.pdf
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5fa567728dfa8.pdf
    • https://xubikorapaja.weebly.com/uploads/1/3/4/3/134335605/ba3c7.pdf
    • https://bizavurodetilu.weebly.com/uploads/1/3/4/3/134391156/lesexuj.pdf
    • https://cdn-cms.f-static.net/uploads/4374542/normal_5fa8ac07e4bd5.pdf
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/zodaxu.pdf
    • https://devomejot.weebly.com/uploads/1/3/4/4/134491467/videxe_riravoxaxawuba.pdf
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/wijilefamivibufu.pdf
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5fab57712f7a2.pdf
    • https://boxomuti.weebly.com/uploads/1/3/4/0/134016719/3241668.pdf
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/297624.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f9a3f45-411a-4ebc-9b17-95ec2fe4e1cb/pediwoposexaneredodexive.pdf
    • https://s3.amazonaws.com/bubeto/16804229703.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc59.bin
3caabedd6e75a7644438c11c0d9c510d5dca25432fa31f6795c5566d4fd8aa12
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 4996 bytes
font_01_sfnt_off0000dd53.bin
197b59b1b3008375497e30c4e3c4e96f173e8a1f530639a29454e73fe5725f42
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 11180 bytes